Students love mixing concoctions so will be happy to complete this experiment.
Select from the following to determine which substances when mixed together form a mixture and which ones form a solution. (Also determines what dissolves and what does not.) Use a jar and shake, or use a container and stir:

Mix water with these and then mix them with oil.
Milk
Gravel or Sand
Salt
Flour
Sugar
Pepper
Coffee
Syrup
Baking Powder
Rice
Cocoa